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This document describes the computer-readable version of the UBV Photoelectric Photometry Catalogue (1986)
(Mermilliod 1987) distributed by the Astronomical Data Center, NASA Goddard Space
Flight Center. This catalog is a compilation of UBV photoelectric
photometry in the Johnson and Morgan system and in closely related systems
published between 1953 and the end of 1985. Listed are identification, V,
B–V, U–B, number of measurements, and references for 136,719 entries
concerning 87,267 stars.

The catalog is in seven files: the first lists data for stars published in the
system of Johnson and Morgan (1953); the second file lists the same information
for measurements in several closely related systems; the third file combines
the data of the first two into a single file; the fourth file lists the full
forms of the references cited by code number in the first three files; the
fifth file contains a list of the references of the fourth file sorted by
journal and volume; the sixth file lists data and additional comments for 933
stars not known to be variable but which have shown a significant difference in
magnitude between two observations; and the seventh file contains a description
of the numbering system of Mermilliod (1978) used to identify objects in this
catalog. The present document describes the overall file structure and the
individual data fields.

1 Introduction

A copy of this document should be distributed with every copy of the
computer-readable catalog.

1.1 Description

The UBV Photoelectric Photometry Catalogue (1986) (UBV86; Mermilliod 1987) is a compilation of UBV photoelectric
photometry in the system of Johnson and Morgan (1953) and closely related
systems published between 1953 and the end of 1985. Listed are identification,
V, B–V, U–B, number of measurements, and references for a total of
136,719 entries concerning 87,267 stars.

The catalog is in seven files: the first lists data for stars published in the
system of Johnson and Morgan (1953); the second file lists the same information
for measurements in closely related systems; the third file combines the data
of the first two into a single file; the fourth file lists the full forms of
the references cited by code number in the first three files; the fifth file
contains a list of the references of the fourth file sorted by journal and
volume; the sixth file lists data and additional comments for 933 stars not
known to be variable but which have shown a significant difference in magnitude
between two observations; and the seventh file contains a description of the
numbering system of Mermilliod (1978) used to identify objects in this catalog.

1.2 Reference

Mermilliod, J.-C. 1987, Astron. Astrophys. Suppl. Ser., 71,
413.

2 Structure

2.1 Each File as a Whole

The UBV86 consists of seven files. Table t:filtab gives the tape-file
attributes that are the same no matter what computer the catalog is copied for.
All records are of fixed length. The first file lists measurements in the
system of Johnson and Morgan (1953); the second file lists measurements in
closely related systems; the third file lists the combined data of the the
previous two (Table t:dattab); the fourth file lists the full forms of
the references cited by code number in the first three files (Table
t:reftab); the fifth file lists the references sorted by journal and
volume number; the sixth file lists data and comments for stars with
inconsistent measurements (Table t:inctab); and the seventh file contains
a description of the numbering system of Mermilliod (1978) used to identify
objects in this catalog. Detailed descriptions of each file are given in the
following sections.

Quotations in any of the following descriptions come from Mermilliod (1987) unless
otherwise noted.

There are also attributes that will change from computer to computer. You will
probably have to know these in order to use your copy of the catalog;
therefore, they should have been supplied with your tape. These attributes are
as follows:

Number of tracks

Density in bytes per inch

Block size in bytes

Number of records in a block

Number of blocks

Character code (ASCII or EBCDIC)

You may wish to write down the values for your tape in the list above.

2.2 Measurements (Files 1, 2, and 3 of 7)

The format for these three files is identical.
The first file includes data in the standard system of Johnson and
Morgan (1953):

All data that have been explicitly referred to the Johnson and Morgan UBV
system have been considered as such. The catalogue also includes the
(U)BV data from the (U)BVRI systems of Kron and Cousins and the
UBV observations from Johnson's UBVRI system when the observation
and reduction have been done separately for the UBV and a separate number
of measurements indicated.

The second file includes measurements ``through UBV filters in closely
related systems.'' Mermilliod (1987) lists the follwing sources for these data:

[Identification] Code number of the star in the system of Mermilliod
(1978) [bytes 1-11, format I11]

[Multiplicity flag] Single-character code: ``D'' indicates an unresolved
binary system; a number identifies one component of a multiple system [byte 12,
format A1]

[Variability flag] ``V'' if the star is variable [byte 13, format A1]

[V] In magnitudes [bytes 14-20, format F7.3]

[B-V] In magnitudes [bytes 21-27, format F7.3]

[U-B] In magnitudes [bytes 28-34, format F7.3]

[Count flag] Single-character code qualifying the number in bytes 38-40.
The following codes are used:

3ex

[/] Indicates that the actual number of observations was not listed in the
source reference; ``1'' has been assumed.

[*] Indicates that there were at least as many observations as indicated
in bytes 38-40.

[byte 37, format A1]

[Number of obs.] Number of observations of this object. For standard stars
this field contains instead the letters ``STD.'' [bytes 38-40, format A3]

[Reference number] Code number of the source reference of this data. The
full forms of these references are listed by code number in the fourth file,
and by journal and volume number in the fifth file. References for the
``related systems'' listed above begin with a two-digit prefix:

8ex

[02XXX] BV, Cape (Nicolet 1975)

[14XXX] UBV, Eggen (Mermilliod and Mermilliod 1986)

[37XXX] UBViyz, Jennens and Helfer (1975)

[08XXX] UBV(RI), Johnson standards (Johnson and Morgan 1953)

[68XXX] UBV(RI), Kunkel and Rydgren (1979)

[72XXX] UBV(RI), Moffet and Barnes (1979)

[73XXX] UBV(RI), Neckel and Chini (1980)

[bytes 44-48, format I5]

2.3 References (File 4 of 7)

This file lists the full forms of the references cited by code number in the
first three files, sorted by number. Each reference has three or more records:
the first record contains the reference number and authors; the second record
holds the year, journal name, volume and page number; and the third and
following records contain the full title of the paper.

[Number] Code number by which this reference is cited in the data files
[bytes 1-5, format I5]

[Text] Full form of the reference. When bytes 1-5 are blank, this field
continues the reference of the previous record. [bytes 9-80, format A72]

2.4 Sorted References (File 5 of 7)

This file contains a list of the references of the fourth file sorted by
journal and volume number and includes header records to separate references
from different journals. This file is useful for determining the reference
number assigned to a given paper. It is formatted as 80-byte lines of text
which may be read and printed out with a FORTRAN A80 format.

2.5 Inconsistencies (File 6 of 7)

This file lists data for those stars not known to be variable, but which show a
difference of > 0.20 mag in V, B–V, or U–B between two or more
different sources. All observations are listed for each of 933 stars. A blank
record separates successive objects.

[Identification] Code number of the star in the system of Mermilliod
(1978) [bytes 1-11, format I11]

[Multiplicity flag] Single-character code: ``D'' indicates an unresolved
binary system; a number identifies one component of a multiple system [byte 12,
format A1]

[V] In magnitudes [bytes 13-19, format F7.3]

[B-V] In magnitudes [bytes 20-26, format F7.3]

[U-B] In magnitudes [bytes 27-33, format F7.3]

[Count flag] Single-character code qualifying the number in bytes 36-38.
The following codes are used:

3ex

[/] Indicates that the actual number of observations was not listed in the
source reference; ``1'' has been assumed.

[*] Indicates that there were at least as many observations as indicated
in bytes 36-38.

[byte 35, format A1]

[Number of obs.] Number of observations of this object. For standard stars
this field contains instead the letters ``STD.'' [bytes 36-38, format A3]

[Reference number] Code number of the source reference of this data. The
full forms of these references are listed by code number in the fourth file,
and by journal and volume number in the fifth file. [bytes 41-45, format I5]

[Error flag] ``*'' indicates that the data of this record have been
identified as faulty. [byte 47, format A1]

[Comment] [bytes 49-80, format A32]

2.6 Numbering (File 7 of 7)

This file contains a description of the numbering system of Mermilliod (1978)
used to identify objects in this catalog. It includes references as well as a
number of tables listing special code numbers, and is formatted as 80-byte
lines of text which may be read and printed out with a FORTRAN A80 format.

Two ranges of object numbers not defined in this file are described below.

15ex

[-40ZZBBBBB] These numbers represent CpD stars in the zones north of
–52○ where CoD numbers are normally expected, but which have no CoD
number. ZZ = zone number, BBBBB = star number.

[-20ZZBBBB] These numbers represent CoD stars in the zones south of
–51○ where CpD numbers are normally expected, but which have no CpD
number. ZZ = zone number, BBBB = star number.

3 History

3.1 Remarks and Modifications

The UBV Photoelectric Photometry Catalogue (1986) (UBV86) was received by the Astronomical Data Center (ADC),
NASA Goddard Space Flight Center, from the Centre de Données Astronomiques,
Strasbourg (CDS), in December 1986.

The original tape consisted of eight text files. The first contained a
description of the seven catalog files and has been incorporated into this
document; the remaining files were formatted as described in the preceding
sections.

A FORTRAN program was run to check the validity of each field according to its
data type and value. A number of errors were discovered, only some of which
could be corrected. A list of all errors and corrections is included in
Appendix A: ``Errata.''

A Errata

During preparation of the data several typographical errors were discovered in
the first three files which were corrected where possible by referring to the
indicated source reference. The following records were found to be in error in
the first file (Johnson system data file). In all cases the identical errors
were discovered in the corresponding record of the third file (merged data
file):

\centering

|
Johnson |Merged ||
|Record |Record |Error and Correction |
|Number |Number || |
2350 |2488 |Number of observations field blank. The value from the
reference (``8'') was inserted. | |
7695 |8929 |V, B-V, U-V, and number of observations misaligned.
The numbers present were realigned. However, the value for
V (.01 mag) is not reasonable. The object could not be
located in the indicated reference. The value listed for
V in the Bonner Durchmusterung is 9.5; V in this
catalog has not been changed. | |
11414 |13065 |Reference number of ``0''. References 1-10 were checked,
but the object could not be found. This field was left
unchanged. | |
61036 |81238 |Typographical error in B-V. The object was found in
the indicated reference and the value changed from ``9.966''
to ``0.966''. | |
83783 |106937 |Non-existent reference number. The object was found in
reference 390. Reference number changed from ``3900'' to
``390''. | |
83784 |106938 |Non-existent reference number. The reference number has
been changed from ``4010'' to ``401'', but the object could
not be located in this reference. References 401-411 were
also checked for this object, without success. | |
83785 |106939 |Non-existent reference number. The object was found in
reference 411. Reference number changed from ``4110'' to
``411''. | |
91036 |116341 |Number of observations blank. The object was found in the
indicated reference and the value ``3'' was inserted into
this field. | |
104618 |130715 |B-V value unreasonable (``18.12''). The reference was
consulted and it was discovered that this is actually the
B magnitude, not B-V. The subtraction was
performed and the field changed to ``-0.29''. | |

\pagebreak

In addition, the following record was found to be in error in the
file of related system measurements:

\centering

|
Related |Merged ||
|Record |Record |Error and Correction |
|Number |Number || |
14822 |60194 |Misaligned data and non-existent reference number.
The object was found in reference 8015. The data were
re-aligned and the reference number was changed from
``80150'' to ``8015''. | |

Finally, during the course of checking out these problems, two errors were also
discovered in the reference files. No attempt has been made to verify the
references in these files, but those errors encountered incidentally are listed
below. The corrections have been made in both reference files.

\centering

|
Reference ||
|Number |Error and Correction | |
100 |Page number changed from ``223'' to ``221''. | |
1464 |Page number changed from ``1272'' to ``254''. (``1272'' is the
number of the issue.) | |